Replace COSMO define with _COSMO_SOURCE

This change might cause ABI breakages for /opt/cosmos. It's needed to
help us better conform to header declaration practices.

libc/x/replaceuser.c

@@ -1,48 +0,0 @@
-/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
-│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
-╞══════════════════════════════════════════════════════════════════════════════╡
-│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
-│                                                                              │
-│ Permission to use, copy, modify, and/or distribute this software for         │
-│ any purpose with or without fee is hereby granted, provided that the         │
-│ above copyright notice and this permission notice appear in all copies.      │
-│                                                                              │
-│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
-│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
-│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
-│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
-│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
-│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
-│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
-│ PERFORMANCE OF THIS SOFTWARE.                                                │
-╚─────────────────────────────────────────────────────────────────────────────*/
-#include "libc/calls/calls.h"
-#include "libc/intrin/safemacros.internal.h"
-#include "libc/mem/mem.h"
-#include "libc/runtime/runtime.h"
-#include "libc/str/str.h"
-
-/**
- * Replaces tilde in path w/ user home folder.
- *
- * @param path is NULL propagating
- * @return must be free()'d
- */
-char *replaceuser(const char *path) {
-  char *res, *p;
-  const char *home;
-  size_t pathlen, homelen;
-  res = NULL;
-  if (path && *path++ == '~' && !isempty((home = getenv("HOME")))) {
-    while (*path == '/') path++;
-    pathlen = strlen(path);
-    homelen = strlen(home);
-    while (homelen && home[homelen - 1] == '/') homelen--;
-    if ((p = res = malloc(pathlen + 1 + homelen + 1))) {
-      p = mempcpy(p, home, homelen);
-      *p++ = '/';
-      memcpy(p, path, pathlen + 1);
-    }
-  }
-  return res;
-}

libc/x/utf16to8.c

@@ -76,7 +76,7 @@ char *utf16to8(const char16_t *p, size_t n, size_t *z) {
       if (x < 0200) {
         *q++ = x;
       } else {
-        w = _tpenc(x);
+        w = tpenc(x);
         WRITE64LE(q, w);
         q += _bsr(w) >> 3;
         q += 1;

libc/x/utf32to8.c

@@ -37,7 +37,7 @@ char *utf32to8(const wchar_t *p, size_t n, size_t *z) {
   if ((q = r = malloc(n * 6 + 1))) {
     for (i = 0; i < n; ++i) {
       x = p[i];
-      w = _tpenc(x);
+      w = tpenc(x);
       do {
         *q++ = w;
       } while ((w >>= 8));

libc/x/x.h

@@ -1,9 +1,7 @@
 #ifndef COSMOPOLITAN_LIBC_X_H_
 #define COSMOPOLITAN_LIBC_X_H_
-#if !(__ASSEMBLER__ + __LINKER__ + 0)
-COSMOPOLITAN_C_START_
-#ifdef COSMO
 
+#ifdef _COSMO_SOURCE
 #define xwrite        __xwrite
 #define xdie          __xdie
 #define xmalloc       __xmalloc
@@ -34,6 +32,11 @@ COSMOPOLITAN_C_START_
 #define xfixpath      __xfixpath
 #define xslurp        __xslurp
 #define xbarf         __xbarf
+#endif /* _COSMO_SOURCE */
+
+#if !(__ASSEMBLER__ + __LINKER__ + 0)
+#ifdef _COSMO_SOURCE
+COSMOPOLITAN_C_START_
 
 int xwrite(int, const void *, uint64_t);
 void xdie(void) wontreturn;
@@ -94,7 +97,7 @@ void *xslurp(const char *, size_t *)
     returnsaligned((4096)) dontdiscard;
 int xbarf(const char *, const void *, size_t);
 
-#endif /* COSMO */
 COSMOPOLITAN_C_END_
+#endif /* _COSMO_SOURCE */
 #endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
 #endif /* COSMOPOLITAN_LIBC_X_H_ */

libc/x/xgetline.c

@@ -23,10 +23,10 @@
 /**
  * Reads line from stream.
  *
- * @return allocated line that needs free() and usually _chomp() too,
+ * @return allocated line that needs free() and usually chomp() too,
  *     or NULL on ferror() or feof()
  * @see getdelim() for a more difficult api
- * @see _chomp()
+ * @see chomp()
  */
 char *xgetline(FILE *f) {
   char *p;

libc/x/xjoinpaths.c

@@ -40,7 +40,7 @@ char *xjoinpaths(const char *path, const char *other) {
     return xstrdup(other);
   } else if (_isabspath(other) || !strcmp(path, ".")) {
     return xstrdup(other);
-  } else if (_endswith(path, "/")) {
+  } else if (endswith(path, "/")) {
     return xstrcat(path, other);
   } else {
     return xstrcat(path, (uintptr_t)'/', other);